The term NOT OUTER is composed of two words, INTERNAL and INNER. INTERNAL is an 8-letter word meaning 'belonging to the inside or INNER part of something' while INNER is a 5-letter word meaning 'situated within or farther within'. Together, they describe something that is not located on the outside or exterior of something. This term is often used to describe the relationship between two objects or ideas, where one is located inside the other.